I don't believe that buying high ranking accounts is good. It tends to bypass the selection process, and it is a bit confusing for members. However, lets say a senior exec from a £10billon exchange wants to join - should he have to start as a newbie, when he clearly isn't a Bitcoin newbie?  I would suggest a new rank of "sponsor", and it would be up to Theymos to decide if an applicant is suitable. Posting and advertising rights could be based on either payment, or the status of the sponsor's organisation.